It can be seen from Fig. 10 that the regression rate obtained from all the four experiments matches very well with the regression rate obtained with the weight loss method. The trend line for these point is shown in Fig. 11. It can be seen from Fig. 11 that the trend line obtained using present methodology matches very well with the regression rate trend line obtained with the weight loss method. The maximumun certainty in the measurement of regression rate, oxidizer mass flux and n were2,0.5and 2.1,respectively.The uncertainty obtainedhere is smaller than those with weight loss method given in Table2[36].